METHOD OF LAYING UNDERGROUND PASSAGES Russian patent published in 1997 - IPC

Abstract RU 2082058 C1

FIELD: construction and repair of underground pipe lines and passages. SUBSTANCE: inflatable pipe made from polyethylene film and hardening composition is sprayed on its inner surface; to keep hardening layer in place, plastic tube is introduced into pipe. EFFECT: enhanced reliability. 5 cl, 3 dwg

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RU 2 082 058 C1

Authors

Ehrik Vud[Gb]

Dates

1997-06-20—Published

1991-11-06—Filed